{
 "method": "Affine fit of OpenStreetMap river centre-lines (Godavari, Nasardi, Waldi, Darna, Waghadi, Alandi) to the river centre-lines of the merged DP map: global search, then iterative closest point. Checked independently against the railway at Nashik Road, Mumbai Naka junction and the Ahilyabai Holkar bridge. Refined with a smooth local correction grid fitted to OpenStreetMap streets (see correction).",
 "accuracy_m": {
  "median": 10,
  "p90": 38,
  "note": "Typical error 5-15 m where streets are mapped (median ~10 m against OpenStreetMap streets, was ~16 m before the local correction); 20-40 m on the sparse outskirts and map edges. Fine for finding your plot; not survey-grade."
 },
 "local_projection": {
  "lat0": 19.95,
  "lon0": 73.8,
  "metres_per_deg_lon": 104606.58254588733,
  "metres_per_deg_lat": 110574,
  "formula": "e=(lon-lon0)*metres_per_deg_lon; s=-(lat-lat0)*metres_per_deg_lat"
 },
 "metres_to_pixel": {
  "matrix": [
   [
    1.2385861423861193,
    0.10999306190004839,
    15573.473521060469
   ],
   [
    -0.1154765311679072,
    1.250307067818259,
    18689.806855928942
   ]
  ],
  "formula": "[x,y] = M[:,0:2] @ [e,s] + M[:,2]  (mosaic pixels, origin top-left)"
 },
 "pixel_to_metres_inverse_2x2": [
  [
   0.8008040452985742,
   -0.07044900504164685
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  [
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   0.7932969578459863
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 ],
 "map_rotation_deg": -5.33,
 "metres_per_pixel": 0.8003,
 "osm_attribution": "Contains data from OpenStreetMap contributors (ODbL), used only to compute this alignment.",
 "correction": {
  "x0": 0,
  "y0": 0,
  "step": 640,
  "nx": 45,
  "ny": 41,
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  "method": "Smooth bilinear grid (mosaic px, indexed by affine px) fitted to OpenStreetMap streets: windowed cross-correlation of OSM street centre-lines against the DP road centre-lines (grey road bands, skeletonised) in 4 coarse-to-fine stages (1.5 km/±250 m down to 380 m/±14 m windows), robust regularised least squares, decaying to 0 (pure affine) away from street evidence. tools/geo/refine_streets.py",
  "residual_m": {
   "metric": "dp_road_to_osm = DP road centre-line px -> nearest OSM street, over px with an OSM street within 60 m (includes DP drawing width and roads missing from OSM); heldout = 20% of OSM streets withheld from the fit -> nearest DP road",
   "before": {
    "dp_road_to_osm_median": 16.0,
    "dp_road_to_osm_p90": 48.6,
    "dp_within10": 0.369,
    "heldout_osm_to_dp_median": 22.4,
    "heldout_osm_to_dp_p90": 56.3,
    "heldout_within10": 0.258
   },
   "after": {
    "dp_road_to_osm_median": 9.6,
    "dp_road_to_osm_p90": 37.7,
    "dp_within10": 0.51,
    "heldout_osm_to_dp_median": 17.3,
    "heldout_osm_to_dp_p90": 49.2,
    "heldout_within10": 0.332
   },
   "crossval_disagreement_m": {
    "nodes": 82,
    "median_m": 14.6,
    "p90_m": 21.4
   },
   "places": {
    "Mahatma Nagar": {
     "before_median": 17.9,
     "after_median": 9.6,
     "shift_m": [40.7,46.1]
    },
    "Nashik Road station": {
     "before_median": 22.4,
     "after_median": 7.0,
     "shift_m": [48.0,10.0]
    },
    "CIDCO": {
     "before_median": 11.5,
     "after_median": 9.6,
     "shift_m": [41.7,58.5]
    },
    "Panchavati": {
     "before_median": 16.0,
     "after_median": 11.5,
     "shift_m": [50.8,28.3]
    },
    "Adgaon": {
     "before_median": 24.3,
     "after_median": 7.0,
     "shift_m": [29.5,37.0]
    },
    "Collector Office": {
     "before_median": 13.4,
     "after_median": 7.0,
     "shift_m": [58.3,25.9]
    },
    "Mumbai Naka": {
     "before_median": 14.1,
     "after_median": 9.0,
     "shift_m": [60.4,56.4]
    }
   }
  }
 }
}